Social Hygiene and Legal Compulsion--The Binding Force of Custom among Savages--The Dissolving Influence of Civilization--The Distinction between Immorality and Criminality--Adultery as a Crime--The Tests of Criminality--National Differences in laying down the Boundary between Criminal and Immoral Acts--France--Germany--England--The United States--Police Administration--Police Methods in the United States--National Differences in the Regulation of the Trade in Alcohol--Prohibition in the United States--Origin of the American Method of Dealing with Immorality--Russia--Historical Fluctuations in Methods of dealing with Immorality and Prostitution--Homosexuality--Holland--The Age of Consent--Moral Legislation in England--In the United States--The Raines Law--American Attempts to Suppress Prostitution--Their Futility--German Methods of Regulating Prostitution--The Sound Method of Approaching Immorality--Training in Sexual Hygiene--Education in Personal and Social Responsibility. The modern development of Social Hygiene in matters of Eugenics has already sufficed to show that there are certain people in the community, anxious to take quick cuts to the millennium, who think that Eugenics can be promoted by hasty legislation. That method of attempting to further social progress is not new. It has been practised with signal lack of success for several thousand years. Therefore, if Social Hygiene is really to progress among us on sane and fundamental lines, it is necessary for us to realize clearly the mistakes of the past. Again and again the blind haste of over-zealous reformers has led not to progress, but to retrogression. The excellent intentions of such social reformers have been defeated, not so much by the evils they have sought to overcome, as by their own excesses of ignorant zeal. As our knowledge of history and of psychology increases, we learn that, in dealing with human nature, what seems the longest way round is sometimes the shortest way home.